5 Simple Techniques For chemical oxygen demand test
5 Simple Techniques For chemical oxygen demand test
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Homogenize five hundred ml of sample for two minutes in a blender to ensure a good distribution of solids through the entire sample. This will guarantee regular final results and stop wild variations in between vials.
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Chemical Oxygen Demand is a crucial metric during the wastewater industry and is typically described as milligrams of oxygen eaten for each liter of sample (mg/L COD).
Despite the fact that colorimetry requires a spectrophotometer or photometer, it provides advantage due to the fact most companies provide premixed reagents, so all you need to do is operate your samples Together with the digestion chemicals and negligible contact.
Nền tảng cho thử nghiệm COD là gần như mọi hợp chất hữu cơ đều có thể bị oxy hóa đầy đủ để tạo ra dioxide cacbon bằng các chất oxy hóa mạnh trong các điều kiện axít.
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The way forward for COD measurement lies in the event of safer, a lot more exact, and a lot more effective more info procedures. As our knowledge of the character and behavior of natural and organic compounds in drinking water enhances, so as well will our power to measure and Manage their influence on the surroundings.
The flask (containing the extracted O&G) is reweighed. The first excess weight in the flask is subtracted and the overall O&G pounds in mg is calculated. The outcome present the O&G focus in mg/L.
The ultimate DO looking at is then subtracted with the First DO looking through and the result would be the BOD concentration (mg/L). If the wastewater sample required dilution, the BOD concentration reading through is multiplied from the dilution factor.
Typical strategy scaling makes use of precisely the same get more info extremely poisonous reagents; nevertheless, a diminishing of volumes of reagent essential plus the processing time of standardized technique enable minimizing the affect of waste technology. Also, costs are lowered though acquiring statistically similar results.
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Environmental regulatory companies create COD limitations for wastewater services that discharge addressed squander to getting bodies of drinking water. Exceeding these restrictions can lead to harsh fines or other penalties.
The permanganate oxidizes the natural make any difference within the sample, and the excess permanganate is then titrated that has a decreasing agent to find out the level of permanganate which was eaten.